$(function(){

var Fireworks = function(){

var self = this;

var rand = function(rMi, rMa){return ~~((Math.random()*(rMa-rMi+1))+rMi);}

var hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2){return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);};

window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)}}();



self.init = function(){ 

self.canvas = document.createElement('canvas');             

self.canvas.width = self.cw = $(window).innerWidth();

self.canvas.height = self.ch = $(window).innerHeight();     
self.canvas.style.zIndex = 10;
self.canvas.style.position="absolute";
self.canvas.style.top=0;
self.canvas.style.left=0;

self.particles = [];    

self.partCount = 150;

self.fireworks = [];    

self.mx = self.cw/2;

self.my = self.ch/2;

self.currentHue = 30;

self.partSpeed = 5;

self.partSpeedVariance = 10;

self.partWind = 50;

self.partFriction = 5;

self.partGravity = 1;

self.hueMin = 0;

self.hueMax = 360;

self.fworkSpeed = 4;

self.fworkAccel = 10;

self.hueVariance = 30;

self.flickerDensity = 25;

self.showShockwave = true;

self.showTarget = false;

self.clearAlpha = 25;



$(document.body).append(self.canvas);

self.ctx = self.canvas.getContext('2d');

self.ctx.lineCap = 'round';

self.ctx.lineJoin = 'round';

self.lineWidth = 1;

self.bindEvents();          

self.canvasLoop();



self.canvas.onselectstart = function() {

return false;

};

};      



self.createParticles = function(x,y, hue){

var countdown = self.partCount;

while(countdown--){

var newParticle = {

    x: x,

    y: y,

    coordLast: [

        {x: x, y: y},

        {x: x, y: y},

        {x: x, y: y}

    ],

    angle: rand(0, 360),

    speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)),

    friction: 1 - self.partFriction/100,

    gravity: self.partGravity/2,

    hue: rand(hue-self.hueVariance, hue+self.hueVariance),

    brightness: rand(50, 80),

    alpha: rand(40,100)/100,

    decay: rand(10, 50)/1000,

    wind: (rand(0, self.partWind) - (self.partWind/2))/25,

    lineWidth: self.lineWidth

};              

self.particles.push(newParticle);

}

};





self.updateParticles = function(){

var i = self.particles.length;

while(i--){

var p = self.particles[i];

var radians = p.angle * Math.PI / 180;

var vx = Math.cos(radians) * p.speed;

var vy = Math.sin(radians) * p.speed;

p.speed *= p.friction;

                

p.coordLast[2].x = p.coordLast[1].x;

p.coordLast[2].y = p.coordLast[1].y;

p.coordLast[1].x = p.coordLast[0].x;

p.coordLast[1].y = p.coordLast[0].y;

p.coordLast[0].x = p.x;

p.coordLast[0].y = p.y;



p.x += vx;

p.y += vy;

p.y += p.gravity;



p.angle += p.wind;              

p.alpha -= p.decay;



if(!hitTest(0,0,self.cw,self.ch,p.x-p.radius, p.y-p.radius, p.radius*2, p.radius*2) || p.alpha < .05){                  

    self.particles.splice(i, 1);    

}

};

};



self.drawParticles = function(){

var i = self.particles.length;

while(i--){

var p = self.particles[i];                          



var coordRand = (rand(1,3)-1);

self.ctx.beginPath();                               

self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));

self.ctx.lineTo(Math.round(p.x), Math.round(p.y));

self.ctx.closePath();               

self.ctx.strokeStyle = 'hsla('+p.hue+', 100%, '+p.brightness+'%, '+p.alpha+')';

self.ctx.stroke();              



if(self.flickerDensity > 0){

    var inverseDensity = 50 - self.flickerDensity;                  

    if(rand(0, inverseDensity) === inverseDensity){

        self.ctx.beginPath();

        self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth,p.lineWidth+3)/2, 0, Math.PI*2, false)

        self.ctx.closePath();

        var randAlpha = rand(50,100)/100;

        self.ctx.fillStyle = 'hsla('+p.hue+', 100%, '+p.brightness+'%, '+randAlpha+')';

        self.ctx.fill();

    }   

}

};

};





self.createFireworks = function(startX, startY, targetX, targetY){

var newFirework = {

x: startX,

y: startY,

startX: startX,

startY: startY,

hitX: false,

hitY: false,

coordLast: [

    {x: startX, y: startY},

    {x: startX, y: startY},

    {x: startX, y: startY}

],

targetX: targetX,

targetY: targetY,

speed: self.fworkSpeed,

angle: Math.atan2(targetY - startY, targetX - startX),

shockwaveAngle: Math.atan2(targetY - startY, targetX - startX)+(90*(Math.PI/180)),

acceleration: self.fworkAccel/100,

hue: self.currentHue,

brightness: rand(50, 80),

alpha: rand(50,100)/100,

lineWidth: self.lineWidth

};          

self.fireworks.push(newFirework);



};





self.updateFireworks = function(){

var i = self.fireworks.length;



while(i--){

var f = self.fireworks[i];

self.ctx.lineWidth = f.lineWidth;



vx = Math.cos(f.angle) * f.speed,

vy = Math.sin(f.angle) * f.speed;

f.speed *= 1 + f.acceleration;              

f.coordLast[2].x = f.coordLast[1].x;

f.coordLast[2].y = f.coordLast[1].y;

f.coordLast[1].x = f.coordLast[0].x;

f.coordLast[1].y = f.coordLast[0].y;

f.coordLast[0].x = f.x;

f.coordLast[0].y = f.y;



if(f.startX >= f.targetX){

    if(f.x + vx <= f.targetX){

        f.x = f.targetX;

        f.hitX = true;

    } else {

        f.x += vx;

    }

} else {

    if(f.x + vx >= f.targetX){

        f.x = f.targetX;

        f.hitX = true;

    } else {

        f.x += vx;

    }

}



if(f.startY >= f.targetY){

    if(f.y + vy <= f.targetY){

        f.y = f.targetY;

        f.hitY = true;

    } else {

        f.y += vy;

    }

} else {

    if(f.y + vy >= f.targetY){

        f.y = f.targetY;

        f.hitY = true;

    } else {

        f.y += vy;

    }

}               



if(f.hitX && f.hitY){

    self.createParticles(f.targetX, f.targetY, f.hue);

    self.fireworks.splice(i, 1);

    

}

};

};



self.drawFireworks = function(){

var i = self.fireworks.length;

self.ctx.globalCompositeOperation = 'lighter';

while(i--){

var f = self.fireworks[i];      

self.ctx.lineWidth = f.lineWidth;



var coordRand = (rand(1,3)-1);                  

self.ctx.beginPath();                           

self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));

self.ctx.lineTo(Math.round(f.x), Math.round(f.y));

self.ctx.closePath();

self.ctx.strokeStyle = 'hsla('+f.hue+', 100%, '+f.brightness+'%, '+f.alpha+')';

self.ctx.stroke();  



if(self.showTarget){

    self.ctx.save();

    self.ctx.beginPath();

    self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1,8), 0, Math.PI*2, false)

    self.ctx.closePath();

    self.ctx.lineWidth = 1;

    self.ctx.stroke();

    self.ctx.restore();

}

    

if(self.showShockwave){

    self.ctx.save();

    self.ctx.translate(Math.round(f.x), Math.round(f.y));

    self.ctx.rotate(f.shockwaveAngle);

    self.ctx.beginPath();

    self.ctx.arc(0, 0, 1*(f.speed/5), 0, Math.PI, true);

    self.ctx.strokeStyle = 'hsla('+f.hue+', 100%, '+f.brightness+'%, '+rand(25, 60)/100+')';

    self.ctx.lineWidth = f.lineWidth;

    self.ctx.stroke();

    self.ctx.restore();

}

};

};



self.bindEvents = function(){

$(window).on('resize', function(){          

clearTimeout(self.timeout);

self.timeout = setTimeout(function() {

    self.canvas.width = self.cw = $(window).innerWidth();

    self.canvas.height = self.ch = $(window).innerHeight();

    self.ctx.lineCap = 'round';

    self.ctx.lineJoin = 'round';

}, 100);

});



$(self.canvas).on('mousemove', function(e){

self.mx = e.pageX - self.canvas.offsetLeft;

self.my = e.pageY - self.canvas.offsetTop;
self.currentHue = rand(self.hueMin, self.hueMax);

self.createFireworks(self.cw/2, self.ch, self.mx, self.my); 



$(self.canvas).on('mousemove.fireworks', function(e){

    self.mx = e.pageX - self.canvas.offsetLeft;

    self.my = e.pageY - self.canvas.offsetTop;

    self.currentHue = rand(self.hueMin, self.hueMax);

    self.createFireworks(self.cw/2, self.ch, self.mx, self.my);                                 

});             

});



$(self.canvas).on('touchend', function(e){

$(self.canvas).off('touchend.fireworks');                                  

});

        

}



self.clear = function(){

self.particles = [];

self.fireworks = [];

self.ctx.clearRect(0, 0, self.cw, self.ch);

};





self.canvasLoop = function(){

requestAnimFrame(self.canvasLoop, self.canvas);         

self.ctx.globalCompositeOperation = 'destination-out';

self.ctx.fillStyle = 'rgba(0,0,0,'+self.clearAlpha/100+')';

self.ctx.fillRect(0,0,self.cw,self.ch);

self.updateFireworks();

self.updateParticles();

self.drawFireworks();           

self.drawParticles();



};



self.init();        



}

var fworks = new Fireworks();



	var page = document.getElementById("page");
	var page2 = document.getElementById("page2");
	
	
	setTimeout(function(){
		page.style.display = "none";
		page2.style.display = "block";
			
	},5000);
		

});